/*
 * ASN.1 DER parsing
 * Copyright (c) 2006, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#ifndef ASN1_H
#define ASN1_H

#define ASN1_TAG_EOC    0x00 /* not used with DER */
#define ASN1_TAG_BOOLEAN  0x01
#define ASN1_TAG_INTEGER  0x02
#define ASN1_TAG_BITSTRING  0x03
#define ASN1_TAG_OCTETSTRING  0x04
#define ASN1_TAG_NULL    0x05
#define ASN1_TAG_OID    0x06
#define ASN1_TAG_OBJECT_DESCRIPTOR  0x07 /* not yet parsed */
#define ASN1_TAG_EXTERNAL  0x08 /* not yet parsed */
#define ASN1_TAG_REAL    0x09 /* not yet parsed */
#define ASN1_TAG_ENUMERATED  0x0A /* not yet parsed */
#define ASN1_TAG_UTF8STRING  0x0C /* not yet parsed */
#define ANS1_TAG_RELATIVE_OID  0x0D
#define ASN1_TAG_SEQUENCE  0x10 /* shall be constructed */
#define ASN1_TAG_SET    0x11
#define ASN1_TAG_NUMERICSTRING  0x12 /* not yet parsed */
#define ASN1_TAG_PRINTABLESTRING  0x13
#define ASN1_TAG_TG1STRING  0x14 /* not yet parsed */
#define ASN1_TAG_VIDEOTEXSTRING  0x15 /* not yet parsed */
#define ASN1_TAG_IA5STRING  0x16
#define ASN1_TAG_UTCTIME  0x17
#define ASN1_TAG_GENERALIZEDTIME  0x18 /* not yet parsed */
#define ASN1_TAG_GRAPHICSTRING  0x19 /* not yet parsed */
#define ASN1_TAG_VISIBLESTRING  0x1A
#define ASN1_TAG_GENERALSTRING  0x1B /* not yet parsed */
#define ASN1_TAG_UNIVERSALSTRING  0x1C /* not yet parsed */
#define ASN1_TAG_BMPSTRING  0x1D /* not yet parsed */

#define ASN1_CLASS_UNIVERSAL    0
#define ASN1_CLASS_APPLICATION    1
#define ASN1_CLASS_CONTEXT_SPECIFIC  2
#define ASN1_CLASS_PRIVATE    3


struct asn1_hdr {
  const u8 *payload;
  u8 identifier, class, constructed;
  unsigned int tag, length;
};

#define ASN1_MAX_OID_LEN 20
struct asn1_oid {
  unsigned long oid[ASN1_MAX_OID_LEN];
  size_t len;
};


int asn1_get_next(const u8 *buf, size_t len, struct asn1_hdr *hdr);
int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,
     const u8 **next);
void asn1_oid_to_str(struct asn1_oid *oid, char *buf, size_t len);
unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);

#endif /* ASN1_H */
